How do I clean the frother?

Clean immediately after each use and before first use. Remove the lid and whisk, then wash the interior of the frother, lid, and whisk with warm, soapy water and dry thoroughly with a soft, non-abrasive cloth. The frother and lid are top rack dishwasher safe, and the whisk should be placed in the utensil basket. If hand washing the whisk, soak it in warm, soapy water for 15 minutes, scrub with a soft-bristled brush, then dry completely before reassembling. (Page 4)

From the official Keurig K Cafe manual, page 4

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